You Need: two bowls
                   water
                   tablespoon
                   salt
                   two fresh raw eggs

Steps:

1. Fill each bowl with water.
2. Tell the children that you are going to do an experiment with salt water and fresh water. Then add four or five tablespoons of salt to one bowl and stir.
3. Ask: What will happen when I put an egg into the bowl of fresh water? You may wish to chart the children's predictions. Do this, and let the children respond. Then repeat, using the other egg and the bowl of salt water.
4. Ask the following questions to encourage the children to draw their own conclusions:
    What happened? (The egg in the salt water floated, and the egg in the fresh water sank.)
    Which type of water can hold up more weight? (Salt water is heavier than plain water and will hold up more weight.)
 
 
 

Rubber Egg

You will need:
            eggs
             glass jars
             vinegar

In a glass jar cover an egg in vinegar. Observe what happens to it. Talk about how the vinegar dissolves the calcium carbonate in the egg shell. The membrane that is left after the shell is gone becomes rubbery and the egg can gently bounced on a table top. This may take overnight.

You can also draw a face on the egg with white crayon, this protects that part of the egg. After the shell disolves you are left with a raised textured face.